Add test cases

[SebastianLindmark]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (java-tdd@4cd64d1). Click here to learn what that means.
The diff coverage is 80%.

@@             Coverage Diff             @@
##             java-tdd      #21   +/-   ##
===========================================
  Coverage            ?   89.47%           
  Complexity          ?       10           
===========================================
  Files               ?        2           
  Lines               ?       19           
  Branches            ?        3           
===========================================
  Hits                ?       17           
  Misses              ?        1           
  Partials            ?        1

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/se/cygni/palmithor/tdd/StringUtils.java	81.81% <80%> (ø)	6 <5> (?)

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